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Have you gone to your local hardware store and checked out the respirators in the paint section? I've seen some rather inexpensive ones you could pick up to play with once you get your buy'ce and then make your decision. I can see a lot of practical applications to having something like a respirator... more room for fans. Just take small steps and you'll get there with what you want the first time out.
No offence, but most would like to see even a rough sketch of what your concept is about rather than a wall of text. You will get more help that way mate